dirac_cppparser.h

/* ***** BEGIN LICENSE BLOCK *****
*
* $Id: dirac_cppparser.h,v 1.2 2005/01/30 05:11:41 gabest Exp $ $Name:  $
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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* Version 1.1 (the "License"); you may not use this file except in compliance
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* the specific language governing rights and limitations under the License.
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* The Original Code is BBC Research and Development code.
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* The Initial Developer of the Original Code is the British Broadcasting
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* Contributor(s): Anuradha Suraparaju (Original Author)
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#ifndef DIRAC_CPPPARSER_H
#define DIRAC_CPPPARSER_H

#include <istream>
#include <streambuf>
#include <libdirac_decoder/decoder_types.h> //for DecoderState
#include <libdirac_common/common.h> 

namespace dirac
{
    class SequenceDecompressor;
    class Frame;

    class InputStreamBuffer : public std::streambuf
    {
    public:
        InputStreamBuffer ();

        ~InputStreamBuffer();

        std::ios::pos_type Rewind();


        std::ios::pos_type Seek(std::ios::pos_type bytes, 
                                std::ios::seekdir pos = std::ios::cur);

        std::ios::pos_type Tell();


        void Copy(char *start, int bytes);

        void PurgeProcessedData();

    private:

        InputStreamBuffer (const InputStreamBuffer& inbuf);

        InputStreamBuffer& operator = (const InputStreamBuffer& inbuf);

        static const int m_buffer_size = 1232896;

        char *m_chunk_buffer;
    };


    class DiracParser
    {
    public:

        DiracParser(bool verbose = false );

        ~DiracParser();
        

        void SetBuffer (char *start, char *end);


        DecoderState Parse();

        const SeqParams& GetSeqParams() const;

        const FrameParams& GetNextFrameParams() const;

        const Frame& GetNextFrame() const;

        const Frame& GetLastFrame() const;


        void  SetSkip (bool skip);

    private:

        DecoderState SeekChunk();

        void InitStateVars();

    private:

        DiracParser (const DiracParser &dp);
        DiracParser& operator = (const DiracParser &dp);
        DecoderState m_state;
        DecoderState m_next_state;
        int m_show_fnum;
        SequenceDecompressor *m_decomp;
        std::istream *m_istr;
        InputStreamBuffer m_sbuf;
        bool m_skip;
        FrameSort m_skip_type;
        bool m_verbose;
        bool m_found_start;
        bool m_found_end;
        unsigned m_shift;
    };

} // namespace dirac

#endif

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